In high-power and high-voltage circuit design, selecting a MOSFET that balances robust performance, thermal management, and cost is a critical engineering challenge. This goes beyond simple part substitution—it requires careful consideration of current capability, switching efficiency, voltage rating, and supply chain stability. This article uses two representative MOSFETs, the AOB2606L (medium-voltage, high-current) and the AOB600A70L (high-voltage), as benchmarks. We will deeply analyze their design cores and application scenarios, and provide a comparative evaluation of two domestic alternative solutions: VBL1603 and VBL17R07S. By clarifying their parameter differences and performance orientations, we aim to provide a clear selection map to help you find the optimal power switching solution.
Comparative Analysis: AOB2606L (60V N-channel) vs. VBL1603
Analysis of the Original Model (AOB2606L) Core:
This is a 60V N-channel MOSFET from AOS in a TO-263 (D2PAK) package. Its design core is to deliver high continuous current (72A) with low conduction loss in a standard power package. The key advantages are: a very low on-resistance of 6.2mΩ at a 10V gate drive, enabling high efficiency in high-current paths. Its substantial current rating makes it suitable for demanding power stages.
Compatibility and Differences of the Domestic Alternative (VBL1603):
VBsemi's VBL1603 is a pin-to-pin compatible alternative in the same TO-263 package. The comparison reveals a significant performance enhancement: while the voltage rating is identical (60V), the VBL1603 offers a dramatically higher continuous drain current (210A) and a lower on-resistance of 3.2mΩ at 10V. This represents a major upgrade in current-handling capability and conduction loss.
Key Application Areas:
Original Model AOB2606L: Ideal for high-current, medium-voltage applications where the 72A rating and 6.2mΩ RDS(on) provide solid performance. Typical uses include:
High-current DC-DC converters and voltage regulators (e.g., for servers, telecom).
Motor drives for industrial equipment or electric vehicles (low-voltage sections).
Power distribution switches and OR-ing circuits.
Alternative Model VBL1603: Suited for upgraded or new designs requiring maximized current capacity and minimized conduction loss. It is an excellent choice for:
Next-generation high-density power supplies demanding higher output current.
Motor drives and solenoid controls where lower RDS(on) reduces heat generation.
Applications seeking a performance margin or needing to derate for higher reliability.
Comparative Analysis: AOB600A70L (700V N-channel) vs. VBL17R07S
This comparison shifts focus to high-voltage switching applications, where voltage withstand and switching loss are primary concerns.
Analysis of the Original Model (AOB600A70L) Core:
This 700V N-channel MOSFET from AOS uses a TO-263 package. Its design pursues a balance between high-voltage blocking capability (700V) and manageable conduction resistance (600mΩ @10V) for its power class. With a continuous current of 8.5A, it targets medium-power off-line or high-voltage DC-DC applications.
Compatibility and Differences of the Domestic Alternative (VBL17R07S):
VBsemi's VBL17R07S is a direct pin-to-pin alternative. The parameters are closely matched: same 700V rating, similar continuous current (7A vs. 8.5A), and a nearly identical on-resistance (750mΩ vs. 600mΩ at 10V). The key differentiator is VBL17R07S's use of Super Junction Multi-EPI technology, which can offer advantages in switching performance and ruggedness.
Key Application Areas:
Original Model AOB600A70L: A reliable choice for standard high-voltage, medium-power switching. Typical applications include:
Power Factor Correction (PFC) stages in SMPS.
Off-line flyback or forward converter primary-side switches.
Inverters for solar micro-inverters or motor drives (high-voltage section).
Alternative Model VBL17R07S: Serves as a highly compatible, performance-similar replacement. Its Super Junction technology makes it well-suited for:
High-efficiency SMPS and PFC circuits requiring fast switching.
Applications where supply chain diversification for 700V MOSFETs is needed without significant redesign.
Designs benefiting from the potential efficiency gains of advanced SJ technology.
Summary
This analysis reveals two distinct selection paradigms:
For 60V high-current applications, the domestic alternative VBL1603 presents a substantial performance-enhanced path over the AOB2606L. With its vastly superior current rating (210A vs. 72A) and lower on-resistance (3.2mΩ vs. 6.2mΩ), it enables higher power density and efficiency in new designs or direct upgrades.
For 700V high-voltage applications, the domestic alternative VBL17R07S offers a highly compatible and performance-similar replacement for the AOB600A70L. With nearly identical key electrical parameters and the benefit of Super Junction technology, it provides a viable and resilient alternative for the supply chain without compromising application performance.
The core conclusion is that selection is driven by precise requirement matching. In the 60V space, domestic alternatives can offer dramatic performance leaps. In the 700V space, they provide reliable, technology-advanced compatibility. This gives engineers greater flexibility in design trade-offs, cost optimization, and building a resilient supply chain. Understanding the parameter implications and technology behind each device is key to unlocking its full potential in your circuit.